<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区视图区域 -->
    <el-card>
      <!-- 警告区 -->
      <el-alert
        show-icon
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
      ></el-alert>

      <!-- 选择商品分类区 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          >
          </el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数
          </el-button>
          <!-- 动态参数表格 -->
          <el-table class="gundong" :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑
                </el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性
          </el-button>
          <!-- 静态属性表格 -->
          <el-table class="gundong" :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑
                </el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 修改参数的对话框 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
        expandTrigger: "hover",
      },
      // 级联选择框双向绑定到的数据
      selectedCateKeys: [],
      // 激活的页签名称
      activeName: "many",
      // 动态参数的数据
      manyTableData: [],
      // 静态参数的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: "",
      },
      // 添加验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {
        attr_name: "",
      },
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    // 获取所有的商品分类列表
    getCateList() {
      this.$http.get("categories").then((res) => {
        if (res.data.meta.status !== 200) {
          return this.$message.error("获取商品分类失败！");
        } else {
          this.catelist = res.data.data;
          // console.log(this.catelist);
        }
      });
    },
    // 级联选择框选中项变化，会触发这个函数
    handleChange() {
      this.getParamsData();
    },
    // tag页签点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName);
      this.getParamsData();
    },
    // 获取参数的列表数据
    getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
      }
      // 证明选中的是三级分类
      // console.log(this.selectedCateKeys);
      // 根据所选分类的id和当前所处的面板获取对应的参数
      this.$http
        .get(`categories/${this.cateId}/attributes`, {
          params: { sel: this.activeName },
        })
        .then((res) => {
          if (res.data.meta.status !== 200) {
            return this.$message.error("获取参数列表失败！");
          } else {
            res.data.data.forEach((item) => {
              item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
              // 控制文本框的显示与隐藏
              item.inputVisible = false;
              // 文本框中输入的值
              item.inputValue = "";
            });
            console.log("123", res.data.data);
            if (this.activeName === "many") {
              this.manyTableData = res.data.data;
            } else {
              this.onlyTableData = res.data.data;
            }
          }
        });
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs["addFormRef"].validate((valid) => {
        if (!valid) {
          return;
        } else {
          this.$http
            .post(`categories/${this.cateId}/attributes`, {
              attr_name: this.addForm.attr_name,
              attr_sel: this.activeName,
            })
            .then((res) => {
              if (res.data.meta.status !== 201) {
                this.$message.error("添加参数失败！");
              } else {
                this.$message.success("添加参数成功！");
                this.addDialogVisible = false;
                this.getParamsData();
              }
            });
        }
      });
    },
    // 点击按钮展示修改的对话框
    showEditDialog(attr_id) {
      // 查询当前参数的信息
      this.$http
        .get(`categories/${this.cateId}/attributes/${attr_id}`, {
          params: { attr_sel: this.activeName },
        })
        .then((res) => {
          if (res.data.meta.status !== 200) {
            this.$message.error("获取参数信息失败！");
          } else {
            this.editForm = res.data.data;
          }
        });
      this.editDialogVisible = true;
    },
    // 重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 点击按钮，修改参数信息
    editParams() {
      this.$refs.editFormRef.validate((valid) => {
        if (!valid) {
          return;
        } else {
          this.$http
            .put(
              `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
              {
                attr_name: this.editForm.attr_name,
                attr_sel: this.activeName,
              }
            )
            .then((res) => {
              if (res.data.meta.status !== 200) {
                this.$message.error("修改参数失败！");
              } else {
                this.$message.success("修改参数成功！");
                this.getParamsData();
                this.editDialogVisible = false;
              }
            });
        }
      });
    },
    // 根据id删除对应的参数项
    removeParams(attr_id) {
      this.$confirm("此操作将永久删除该参数, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .catch((err) => {
          return err;
        })
        .then((confirmResult) => {
          // 用户取消了删除的操作
          console.log(confirmResult);
          if (confirmResult !== "confirm") {
            return this.$message.info("已取消删除！");
          } else {
            // 删除的业务逻辑
            this.$http
              .delete(`categories/${this.cateId}/attributes/${attr_id}`)
              .then((res) => {
                if (res.data.meta.status !== 200) {
                  this.$message.error("删除参数失败！");
                } else {
                  this.$message.success("删除参数成功！");
                  this.getParamsData();
                }
              });
          }
        });
    },
    // 文本框失去焦点，或按下了Enter都会触发
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      // 如果没有return，则证明输入的内容，需要作后续处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      this.saveAttrVals(row);
    },
    // 将对attr_vals的操作，保存到数据库
    saveAttrVals(row) {
      // 需要发起请求，保存这次操作
      this.$http
        .put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" "),
        })
        .then((res) => {
          if (res.data.meta.status !== 200) {
            return this.$message.error("修改参数项失败！");
          } else {
            this.$message.success("修改参数形成功！");
          }
        });
    },
    // 显示输入框的切换
    showInput(row) {
      row.inputVisible = true;
      // 让文本框自动获得焦点
      // 页面上的元素被重新渲染之后调用$nextTick函数
      this.$nextTick(() => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 删除对应的参数和选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
      this.saveAttrVals(row);
    },
  },
  computed: {
    // 如果按钮需要被禁用则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      } else {
        return false;
      }
    },
    // 当前选中的三级分类的id值
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      } else {
        return null;
      }
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      } else {
        return "静态属性";
      }
    },
  },
};
</script>
<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>
<style lang="less">
.gundong .el-table__body-wrapper {
  max-height: 345px;
  overflow-y: scroll;
}
</style>